feat: add sp blocklist to skip checks for specific providers

[silent-cipher]

Closes #364

[Copilot]

Pull request overview

Adds a global Storage Provider (SP) blocklist feature so scheduled automation can skip running checks against specific providers, addressing issue #364.

Changes:

• Introduces BLOCKED_SP_IDS and BLOCKED_SP_ADDRESSES env vars and plumbs them into backend config as spBlocklists.
• Applies blocklist filtering to scheduled jobs (deal, retrieval, data_set_creation) and data-retention polling.
• Adds unit tests for the blocklist helper and for job/data-retention behavior under blocking.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
docs/environment-variables.md	Documents new SP blocklist env vars and behavior scope (scheduled-only).
apps/backend/src/config/app.config.ts	Adds env vars + parsing into spBlocklists config structure.
apps/backend/src/common/sp-blocklist.ts	Adds isSpBlocked() helper used across schedulers/services.
apps/backend/src/common/sp-blocklist.spec.ts	Unit tests for isSpBlocked() behavior.
apps/backend/src/jobs/jobs.service.ts	Skips scheduling and runtime execution for blocked providers; updates tested-provider gauge logic.
apps/backend/src/jobs/jobs.service.spec.ts	Adds tests for schedule skipping, runtime skipping, and gauge behavior with global blocklists.
apps/backend/src/data-retention/data-retention.service.ts	Filters blocked providers out of data-retention polling inputs.
apps/backend/src/data-retention/data-retention.service.spec.ts	Adds tests ensuring blocked providers are excluded from polling.
apps/backend/.env.example	Adds commented examples for the new blocklist env vars.

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[SgtPooki]

in general lgtm, i opened a small pr on top: #455